Cutter for ribbed metal lath.



R. w. AnAMs & J. A. SURREY.

CUTTER FOR RIBBED METAL LATE.

APPLICATION FILED MAY 1, 1912.

1,044,966. Patented Nov. 19, 1912.

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CUTTER FOR RIIBBED METAL LATE.-

Specification of Letters I'atent.

Patented Nov. 19, 1912.

To all whom it may concern:

Be it lmown that we, RALPH W. ADAMS and Jnssn ALBERT CURREY, citizensofthe United States, and residents, respectively, of Spokane, county ofSpokane, State of Washington, and Portland, county of Multnomah, Stateof Oregon, have invented a new and useful Improvement in Cutters forRlbbed' Metal Lath, of which the followlng 1s a specification. p

This application being intended as a revival and completion of theapplication heretofore filed by the above named applicants for animprovement in cutter for ribbed metal lath, filed July 12, 1909, SerialNo. 507,241.

This invention has for its object to provide an improved means forshearing or cutting, into suitable lengths, metal lath having transverseribs or protruding creases along its length, and particularly suchmaterial as is commercially known by the name of Hy-Rib, withoutcrushing such ribbed portions in the operation; and to this end ourinvention comprises a pair of pivotally related shear blades provided,respectively, with recesses and corresponding projections at theircutting edges, located and adapted to receive and cut through suchribbed portions without crushing them.

In the drawin s: Figure -1 is a perspective view of our device; Fig. 2is a cross section through the shearing portions of our device; an Fig.3 shows a section of the material above referred to as Hy-Rib The base,a, is adapted to be affixed to some table, and is provided with aflange, 6, adapted to have removably aflixed thereto, by screws, lc,'ashear blade 0, made with recesses or notches, d, in its cutting edge.The base, a, is further provided with a hmge-lug e, to which is hinged alever f, the front end of which projects through a perpendicular guideg, also supported on the base a. To the lever f is removably attached,by screws Z, a shear blade it, made with projections, 73, on its cuttingedge 7', which reglster with the recesses d of the blade a.

. The related recesses and projections, d, i, will, of course, have tobe located to suit the locations of the protruding cross ribs of theparticular Hy-Rib material to be cut. In practice the Hy-Rib material islaid on the blade 0 with the transverse ribs m in the recesses d, and inthe downward movement of the lever f the projections, i, and the bladeit, will enter the hollow of the rib ortions lying in said recesses andsupport t e walls of the rib against being collapsed or crushed duringthe shearing action. The cutting edge 7' is made convex so as tofacilitate the shearing action. In other words, the convex shape of thecutting edge of the upper blade introduces a special feature. It causesthe cutting projections 21 of such blade, when entering the depressionsd of the blade 0, to have a sort of'rolliug motion, facilitating thecutting of the walls of the protruding portions m of-the lath material,like a pair of shears instead of like a chisel.

The blades, 0, h, are made removable, so that the same cutter ma be usedto cut different styles or types of metal lath, by simply substitutingsuitable shearing blades havimg the general properties descrlbed above.

We claim:

1. In a cutter for ribbed metal lath, the combination of a base and alever pivoted thereto, a shear-blade on the base, such shear-bladeformed with recesses in its cutting edge adapted to receive theprotruding portions of the material to be cut a shearblade on saidlever, such shear-blade formed with projections corresponding with saidrecesses of the shear-blade of the base, and its cutting edge beingconvex, whereby a rolling motion is imparted to' its said projectionswhen entering said recesses and cutting the portions of the materialtherein seated.

2. In a cutter for ribbed metal lath, the combination of a base and alever pivoted thereto, a shear-blade removably fastened to the base,such shear-blade formed with recesses in its cutting edge adapted toreceive the protruding portions of the material to be cut, a shear-bladeremovably fastened to said lever, such shear-blade formed withprojections corresponding with said recesses of the shear-blade of thebase, and its cutting edge being convex, whereby a' rolling motion isimparted to its said projections when entering said recesses and cuttingthe portions of the material therein seated.

RALPH W. ADAMS. JESSE ALBERT CURREY.

Witnesses:

FRED A. S'roLz, Gnon. LONG.

